Hi ! You have not mentioned if you practice any preventive contraceptives or not. In case you do not, it might have been a missed abortion
as you have passed clots which are unusual for you. The cramping may be the after effects of this, or some products of conception might have been retained in the uterus
. Possbibly you should see a gynaecologist who after clinical examination, may advise you for a urine pregnancy
test or a serum HCG estimation, and an ultrasound
to exclude these possibilities.
Wishing you an early recovery. Thanks.